3.6.6
Curved Walls and Ceilings
INSTALLATION
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General Requirements
Framing
Plasterboard Fixing
365
365
366
CONSTRUCTION
DETAILS
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INTRODUCTION
With careful installation and proper
This section provides details on
Plasterboard can be curved
to create imaginative
architectural effects.
framing methods, tightly curved
how to bend plasterboard, including
walls and ceilings are possible.
installation, framing geometry and
CurveShield is designed for this
bend radius information.
purpose and will achieve the tightest
curves. All of the Knauf plasterboard
product range can be curved
if required.
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GENERAL REQUIREMENTS
Only use CurveShield for applications where the radius is less than 900mm.
Fix ceiling framing at 300mm maximum centres for installation of CurveShield.
Ensure that the radius on the convex side is not too tight for the corresponding concave side.
Stagger recessed edges and butt joints by 200mm minimum between layers.
Curve plasterboard along the short edge (widthways) for tighter radii and easier jointing.
Curve fire rated walls and ceilings to a minimum radius of 3000mm.
WETTING CURVED PLASTERBOARD
A Rondo Flexi-Track and stud system is
recommended for framing curved walls
or ceilings.
Hot, humid conditions are ideal for curving plasterboard.
In cold, low-humidity conditions or if very tight curves are
required, prepare the plasterboard as follows:
Avoid joints parallel to studs in the
curved section.
Use a clean paint roller or sponge to apply a small
amount of water to the plasterboard surface that will
be in compression. Add a small amount of detergent
to the water in very dry conditions to act as a
wetting agent.
A minimum of two layers of CurveShield
is recommended.
Allow at least 15 minutes for the water to soak
in before bending the plasterboard.
FRAMING
MAXIMUM FRAME SPACING AND MINIMUM CURVE RADIUS FOR CURVESHIELD
Curve Radius (mm)
250-450
450-650
650-900
900-1000
1000-1500
1500-2000
2000-2500
2500-3000
3000-4000
> 4000
Maximum Framing Centres (mm)
Concave CurveShield
Curved along length
–
–
200
200
200
250
300
350
450
550
Convex CurveShield
Curved along length
–
200
200
200
200
250
300
350
450
550
Concave CurveShield
Curved along width
–
150
150
150
200
250
300
350
450
550
Convex CurveShield
Curved along width
125
150
150
150
200
250
300
350
450
550
MAXIMUM FRAME SPACING AND MINIMUM CURVE RADIUS FOR OTHER PLASTERBOARD
MastaShield only
All plasterboard except AcoustiShield*
Curve Radius (mm)
900-1000
Plasterboard Thickness
1000-1500
1500-2000
2000-2500
2500-3000
3000-4000
> 4000
Maximum Framing Centres (mm)
10mm
150
200
250
300
350
400
500
13mm
–
150
200
250
300
400
500
16mm
–
–
–
–
200
250
350
*AcoustiShield has a minimum curve radius of 5000mm
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INSTALLATION: General Requirements
INSTALLATION
and Framing
The minimum curve radius is determined
by the concave side.
3.6.6 Curved Walls and Ceilings
Only the face layer needs to be jointed.
PLASTERBOARD FIXING
FIGURE 1 Concave Wall – Horizontal
Curved lengthways
200mm max stud
spacing around curve
200mm min / 300mm
max to first stud in
straight section
200mm min /
300mm max to first
stud in straight section
150m
m max
200mm max
staggered
Fixing
Sheet Layout
Fasteners
Screw Only Method
Field
Fix at 150mm max centres on straight
sections. Do not fix screws on the field
of the plasterboard in the curved section.
Recessed
Edges
Butt Joints
Fix on each stud. Stagger recessed edges
by 300mm min between layers.
Sealant
Use sealant on all gaps and around
perimeter to maintain acoustic integrity.
[Refer to Construction Details]
Fixing
Sheet Layout
Perimeter
Fastener Only Method
Field
Fix screws or double nails at 300mm max
centres. Fix nails at 200mm max centres.
Horizontal
Perimeter screws 10-15mm from sheet edges
except at top and bottom tracks. Plasterboard
must not be fixed to top and bottom tracks.
Fix at 200mm max centres and stagger
screws. Stagger butt joints by 300mm
between layers and on opposite sides
of the wall.
10-15mm
50mm
650mm minimum radius
FIGURE 2 Concave Wall – Vertical
Curved widthways
200mm min /
300mm max to first
stud in straight
section
INSTALLATION: Plasterboard Fixing
3.6.6 Curved Walls and Ceilings
Fix on
each stud
150mm max stud
spacing around curve
200mm min /
300mm max to first
stud in straight
section
Vertical
Perimeter fasteners 10-15mm from sheet edges
Recessed Edges Fix screws at 200mm max centres. Fix nails
at 150mm max centres. Stagger fasteners.
Stagger recessed edges by 300mm min on
opposite sides of the wall. Recessed edges
must be backed by a stud.
Butt Joints
150m
m max
Fix screws at 200mm max centres. Fix nails
at 150mm max centres. Stagger fasteners.
Stagger butt joints by 600mm min on adjoining
sheets and on opposite sides of the wall. 1st
layer butt joints must be backed by a nogging.
Fix at 200mm max centres
Internal and
External Corners
Fix at 200mm max centres
Openings
Use fire sealant on all gaps and around
Fire Sealant
200mm max
staggered
10-15mm
perimeter to maintain fire and acoustic
integrity. [Refer to Construction Details]
Jointing Face
Layer
As a minimum, only use paper tape with
either two coats of MastaBase/MastaLongset
or three coats of MastaLite. [Refer to Section 4]
50mm
450mm minimum radius
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Technical Advice 1300 724 505 knaufplasterboard.com.au
Screw Only Method
Field
Fix at 150mm max centres on straight
sections. Do not fix screws on the field
of the plasterboard in the curved section.
Recessed
Edges
Butt Joints
Fix on each stud. Stagger recessed edges
by 300mm min between layers.
Sealant
Use sealant on all gaps and around
perimeter to maintain acoustic integrity.
[Refer to Construction Details]
Fixing
Sheet Layout
Fasteners
Screw Only Method
Field
Fix at 150mm max centres on straight sections.
Do not fix screws on the field of the plasterboard
in the curved section.
Recessed
Edges
Fix at 200mm max centres and stagger
screws. Stagger recessed edges by 300mm
min between layers and on opposite sides of
the wall.
Butt Joints
Fix at 200mm max centres and stagger screws.
Stagger butt joints by 600mm min between
layers, on adjoining sheets and on opposite
sides of the wall. 1st layer butt joints must be
backed by a nogging or back-blocked.
Sealant
Use sealant on all gaps and around
perimeter to maintain acoustic integrity.
[Refer to Construction Details]
50mm
Fix on
each stud
150mm
max
200mm max
staggered
Horizontal
Perimeter screws 10-15mm from sheet edges
except at top and bottom tracks. Plasterboard
must not be fixed to top and bottom tracks.
Fix at 200mm max centres and stagger
screws. Stagger butt joints by 300mm
between layers and on opposite sides
of the wall.
10-15mm
200mm min /
300mm max to first
stud in straight
section
200mm min /
300mm max to first
stud in straight
section
200mm max stud
spacing around curve
FIGURE 4 Convex Wall – Vertical
Curved widthways
250mm minimum radius
50mm
Fix on
each stud
150mm
max
200mm max
staggered
Vertical
Perimeter screws 10-15mm from sheet edges
except at top and bottom tracks. Plasterboard
must not be fixed to top and bottom tracks.
10-15mm
200mm min / 300m
max to first stud in
straight section
200mm min / 300mm
max to first stud in
straight section
125mm max stud
spacing around curve
Technical Advice 1300 724 505 knaufplasterboard.com.au
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3.6.6 Curved Walls and Ceilings
450mm minimum radius
Fixing
Sheet Layout
Fasteners
INSTALLATION: Plasterboard Fixing
FIGURE 3 Convex Wall – Horizontal
Curved lengthways
NON-FIRE RATED
CURVED WALL AND CEILING DETAIL
Stud spacing
Convex curve
Plasterboard
3.6.6 Curved Walls and Ceilings
Flexible track
Concave curve
CONSTRUCTION DETAILS
FIGURE 5 Curved Wall
Plan view
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Technical Advice 1300 724 505 knaufplasterboard.com.au
1200mm max
Screw each side of
lock-key to top cross rail
Top cross rail (curved)
150mm max
Refer to curve table
3.6.6 Curved Walls and Ceilings
FIGURE 6 Curved Suspended Ceiling
Elevation
1200mm max
Furring channel
(curved)
A-clip
Curved plasterboard
CONSTRUCTION DETAILS
FIGURE 7 Curved Ceiling
Elevation
Technical Advice 1300 724 505 knaufplasterboard.com.au
369